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Synthesis of (E)-N-[methyl-d3]-4-(3-pyridinyl)-3-buten-1-amine, a deuterated analogue of the nicotinic agonist RJR-2403

1998; Wiley; Volume: 41; Issue: 12 Linguagem: Inglês

10.1002/(sici)1099-1344(199812)41

1099-1344

Peter A. Crooks, Alain Ravard, Gary D. Byrd,

Chemical Reactions and Isotopes

The synthesis of (E)-N-[methyl-d3]-4-(3-pyridinyl)-3-buten-1-amine ([methyl-d3]RJR 2403; [methyl-d3]metanicotine) is reported. The incorporation of deuterium was performed during the first step of the synthesis via N-methylation of the pyrrolidine nitrogen of racemic nornicotine with [methyl-d3]iodomethane, in the presence of n-BuLi at −70°C to afford racemic [methyl-d3]nicotine in high yield (91%). The pyrrolidine ring was then cleaved with ethyl chloroformate to give (E)-N-[methyl-d3]-N-ethyloxycarbonyl-4-(3-pyridinyl)-3-buten-1-amine; in this reaction, elimination of HCl occurred during heating of the intermediate N-[methyl-d3]-N-ethyloxycarbonyl-4-chloro-4-(3-pyridinyl)butan-1-amine under vacuum (0.5 mm Hg). The last step of the synthesis, i.e. the removal of the N-carbamoyl group, was achieved via acidic hydrolysis with concentrated aqueous hydrochloric acid, to afford [methyl-d3]metanicotine in 82% overall yield. The isotopic purity of the sample was determined by mass spectrometry and calculated to be 97.6 atom % deuterium. Copyright © 1998 John Wiley & Sons, Ltd.